Zend_Form Failing validation with Optional File in IE10 - php

Question

TL;DR: Zend_Form_Element_File is not playing nice with IE10
Alright, bear with me while I unravel this tale of one of the worst bugs I've ever encountered. (Only applies to IE10)
I'm using a Zend_Form (Zend Framework 1.12) with a Zend_Form_Element_File:
$file = (new Zend_Form_Element_File('file'))
->setRequired(false);
I'm also using jQuery Form Plugin to use AJAX or an iFrame when appropriate. (Which is a new development, previously I was only using an iframe [and this bug was found in that version] and I since moved the iframe to be XHR2 Feature Detected).
So we have this form that AJAXly submits the file and the other variables to the server, which tries to validate it through Zend_Form. No big deal. Chrome and Firefox send empty files which Zend detects and goes no problem, and IE was sending nothing related to the file, and is now sending an empty parameter named file (NOT an empty file) and Zend_Form is saying that the "file is too big."
The files array is empty, So I implemented the patch suggested on Zend Issue ZF-12189 to get:
$check = $this->_getFiles($files, false, true);
if (empty($check)) {
if ($this->_options['ignoreNoFile']) {
return true;
}
return false;
}
but as $check is not evaluating as empty the problem persists.
Relevant Request Headers:
X-Requested-With: XMLHttpRequest
Accept: text/html, */*; q=0.01
Content-Type: multipart/form-data; boundary=---------------------------7dd299161d06c6
Content-Length: 580
Request Body:
-----------------------------7dd299161d06c6
Content-Disposition: form-data; name="entryId"
9
-----------------------------7dd299161d06c6
Content-Disposition: form-data; name="csrf"
b9774f3998695465d9b3079eb028e342
-----------------------------7dd299161d06c6
Content-Disposition: form-data; name="description"
test
-----------------------------7dd299161d06c6
Content-Disposition: form-data; name="MAX_FILE_SIZE"
2097152
-----------------------------7dd299161d06c6
Content-Disposition: form-data; name="file"
-----------------------------7dd299161d06c6--
Form Messages:
{"file":{"fileUploadErrorIniSize":"File 'file' exceeds the defined ini size"}}
Does anyone know of a solution to this problem?

Answer 1

Here is a workaround you can add to override the Zend_Form's isValid() method. There is a legitimate bug out there that generates the same error when no files are uploaded yet it still attempts to validate anyway. Maybe this will help someone out there.
public function isValid($data) {
$valid = parent::isValid($data);
$errorCount = 0;
foreach($this->getElements() as $elem) {
if ($elem->hasErrors()) {
$errorCount++;
}
// Related issues:
// http://framework.zend.com/issues/browse/ZF-12159
// http://framework.zend.com/issues/browse/ZF-10279
// http://framework.zend.com/issues/browse/ZF-12189
if ($elem instanceof Zend_Form_Element_File && !$elem->isRequired() && !isset($_FILES[$elem->getName()]) && $elem->hasErrors()) {
$elem->clearErrorMessages();
$elem->setTransferAdapter( 'Http' ); // reset any errors that may be on the transfer adapter
$errorCount--;
}
}
if ($this->_errorsForced) {
return false;
}
if ($errorCount==0) {
$this->_errorsExist = false;
}
return $errorCount==0;
}

Answer 2

you may want to see this issue: Form Bug in JS
When we ran into this, we just forced iFrame: true and that did the trick. It made me a little sad, but it works. :)